memcpy ( )【C语言库函数源代码】

【C语言库函数源代码】

【本程序在Dev C++ 4.9.9.2 下编译通过】

/*

   memcpy() copies a source memory buffer to a destination memory buffer. This routine does NOT recognize overlapping buffers, and thus can lead to propogation.For cases where propagation must be avoided, memmove() must be used.

   memcpy()由src指定内存区域拷贝count个字符到dst所指定的内存区域。src和dst内存区域不能重叠，函数返回指向dst的指针。

*/

void * my_memcpy(void *dst,const void *src,int count)

{

   void * ret = dst;

   while (count--)

   {

      *(char *)dst = *(char *)src;

      dst = (char *)dst + 1;

      src = (char *)src + 1;

   }

   return(ret);

}

int main()

{

   char a[12];

   puts((char *)my_memcpy(a,"ammana_babi",16));

   system("pause");

   return 0;

}